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Manifold Drift in Flow Preference Optimization: A Root Cause of Reward Hacking

Manifold drift pushes flow preference optimization off the data manifold via terminal displacement normal components; ThermoDPO-weighted improves strict score and image metrics over FlowDPO.

Yansen Han, Shengyi Liao, Yuanxing Zhang, Pengfei Wan and 1 more

Sydney Poster Session 2, Tue, Dec 8, 5:00 PM–8:00 PM, Hall 1-4 · Published 2026

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AI panel: 14 of 20 reviewers recommend it
lenient 3/5
medium 9/10
strict 2/5